Terragenesis has a nice article on casting bunkers in plaster from chocolate boxes.
Modeling
Building Mad Scientist Labs
Terragenesis has an article on building laboratory equipment for mad scientists. The photos show an amazing use of various household and electronics bits.
Miles Of Barbed Wire
Tim’s Wargaming Blog has a photo tutorial on making “36 Miles of Barbed Wire.”
Tutorial On Using Amazing Mold Putty & Amazing Casting Resin
The Hawgleg site has a tutorial on using Amazing Mold Putty and Amazing Casting Resin to make models. The two products are available at stores like Hobby Lobby
Modeling A Shack From Scraps
This is a great video on modeling an abandoned farmhouse or shack for your wargames table.